Karel Ruber - Academia.edu (original) (raw)
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Papers by Karel Ruber
Many commercial partitions such as walls, windows and doors can provide reasonable sound insulati... more Many commercial partitions such as walls, windows and doors can provide reasonable sound insulation in medium and high frequency ranges. Those structures often perform in the mass control region of the acoustic spectrum and follow the “Mass Law” model. However, the Mass Law often does not provide adequate noise insulation at low frequencies. Hence other methods of increasing the sound insulation are required. One of those methods involves attaching to the vibrating structure a tuned mass or Tuned Vibration Absorber (TVA).While the TVA was invented over a century ago and was used successfully to reduce structural vibrations, applications to acoustics problems are relatively new. Most of researches in the last decade focused on TVA tuned to the excitation frequencies and the TVAs were not always optimised or they have been designed with little damping. This paper investigates the effect of attaching a highly damped TVA on sound transmission loss of panels. The numerical simulations sh...
Low Frequency Noise, Vibration and Active Control, 2015
Sound transmission loss (STL) tests of acoustic insulation panels are commonly performed in large... more Sound transmission loss (STL) tests of acoustic insulation panels are commonly performed in large reverberation rooms. Large size rooms are required by acoustic standards to ensure that a large number of modes can be excited in the frequency range of interest, to create a diffuse sound field. However for STL measurements in low frequency range small enclosures should be able to provide adequate homogenous sound fields, namely ‘pressure sound fields’. The expected effect of the air sealed in an enclosure backing a panel, is to increase the stiffness of the panel artificially raising the first natural frequency of the panel, which corresponds to a minimum value in the STL spectrum. In this paper the influence of the air cavity's added stiffness on the panel STL is investigated in detail. As expected the effect of the sealed air is to increase the plate stiffness and as a result to increase the frequency of its first natural mode, however the effect on the STL in this frequency reg...
acoustics.asn.au
Many commercial partitions such as walls, windows and doors can provide reasonable sound insulati... more Many commercial partitions such as walls, windows and doors can provide reasonable sound insulation in medium and high frequency ranges. Those structures often perform in the mass control region of the acoustic spectrum and follow the “Mass Law” ...
Many commercial partitions such as walls, windows and doors can provide reasonable sound insulati... more Many commercial partitions such as walls, windows and doors can provide reasonable sound insulation in medium and high frequency ranges. Those structures often perform in the mass control region of the acoustic spectrum and follow the “Mass Law” model. However, the Mass Law often does not provide adequate noise insulation at low frequencies. Hence other methods of increasing the sound insulation are required. One of those methods involves attaching to the vibrating structure a tuned mass or Tuned Vibration Absorber (TVA).While the TVA was invented over a century ago and was used successfully to reduce structural vibrations, applications to acoustics problems are relatively new. Most of researches in the last decade focused on TVA tuned to the excitation frequencies and the TVAs were not always optimised or they have been designed with little damping. This paper investigates the effect of attaching a highly damped TVA on sound transmission loss of panels. The numerical simulations sh...
Low Frequency Noise, Vibration and Active Control, 2015
Sound transmission loss (STL) tests of acoustic insulation panels are commonly performed in large... more Sound transmission loss (STL) tests of acoustic insulation panels are commonly performed in large reverberation rooms. Large size rooms are required by acoustic standards to ensure that a large number of modes can be excited in the frequency range of interest, to create a diffuse sound field. However for STL measurements in low frequency range small enclosures should be able to provide adequate homogenous sound fields, namely ‘pressure sound fields’. The expected effect of the air sealed in an enclosure backing a panel, is to increase the stiffness of the panel artificially raising the first natural frequency of the panel, which corresponds to a minimum value in the STL spectrum. In this paper the influence of the air cavity's added stiffness on the panel STL is investigated in detail. As expected the effect of the sealed air is to increase the plate stiffness and as a result to increase the frequency of its first natural mode, however the effect on the STL in this frequency reg...
acoustics.asn.au
Many commercial partitions such as walls, windows and doors can provide reasonable sound insulati... more Many commercial partitions such as walls, windows and doors can provide reasonable sound insulation in medium and high frequency ranges. Those structures often perform in the mass control region of the acoustic spectrum and follow the “Mass Law” ...